For projectile momentum conservation formula can not be applied because external force gravity is acting?

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Solution

yes conservation of momentum is only applicable when no external force acting on the object.
In projectile motion force due to gravity is applicable hence conservation of momentum is not applicable here.

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For projectile momentum conservation formula can not be applied because external force gravity is acting?

yes conservation of momentum is only applicable when no external force acting on the object. In projectile motion force due to gravity is applicable hence conservation of momentum is not applicable here.

yes conservation of momentum is only applicable when no external force acting on the object.
In projectile motion force due to gravity is applicable hence conservation of momentum is not applicable here.